Finding the Fourth Proportional to 12,495.60, 17,238.78 and 8,720.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,495.60 : 17,238.78 = 8,720.96 : x
2. Step 2: Convert to fraction form
   12,495.60/17,238.78 = 8,720.96/x
3. Step 3: Cross multiply
   12,495.60x = 17,238.78 × 8,720.96
4. Step 4: Simplify right side
   12,495.60x = 150,338,581.03
5. Step 5: Solve for x
   x = 150,338,581.03/12,495.60
6. Step 6: Final answer
   x = 12,031.32